This is the most basic mode of VXLAN Layer 3 gateway (L3GW). In this mode of the L3GW, the VE is configured directly on the VLAN associated with the VXLAN Virtual Tunnel End Point (VTEP), which is mapped to the tunnel VXLAN Network Identifier (VNI).
One or more attachment circuit (AC) endpoints can be associated with the VLAN that is mapped to the VXLAN VE, or the VLAN can just contain the tunnel as its only member. The VXLAN tunnel is static, meaning that it is configured manually. The following figure illustrates a static L3GW topology.
Static L3GW topology
The scenario for this topology is as follows:
A customer has two subnets, 10.1.1.0/24 and 10.2.2.0/24, which have hosts 10.1.1.3 (VNI 5000) and 10.2.2.3 (VNI 5001), respectively. The VRF of the customer is configured as VRF1 on the SLX nodes.
Also on the SLX nodes, VLAN 10 (configured with routing VE1) maps to VNI 5000, and VLAN 20 (configured with routing VE2) maps to VNI 5001.
Host 10.1.1.2 (Ethernet 1/1, VLAN10) maps to VNI 5000, and Host 10.2.2.2 (Ethernet 1/2, VLAN 20, maps to VNI 5001).
If Host 10.1.1.3 must communicate with Host 10.2.2.2, packets must be routed at the VRF1 level. Packets come in on VXLAN tunnel 1 (VNI 5000) and are decapsulated and sent to interface Ethernet 1/1 upon ARP resolution, or an ARP resolution is attempted if the ARP is not resolved.
